Hi
1) Use the sunrise table, and find the LMT of sunrise@ 50N (interpolate it for the 25th of jan)
Once u have the LMT, Convert it to UTC by considering ur Long (i.e. 7E/ 15)
Since long is E, UTC is least(UTC<LMT), now uve got ur ans.
(i cannot determine this ans for, since the sunrise tables dat i have might be for a diff year)
2) Here u have to find the angle between the R.L and G.C at A, This is nothing but ur conversion angle, i.e. Convergency/2.
Con= D.long*Sin Lat
= 18*sin 60
=15.58
Therefore C.A.=15.54/2=7.79
3) Find the LMT the of sunrise on the 6th of dec from the sunrise tables.
Once u have the LMT, Convert it to UTC by considering ur Long (i.e. 123 30W/ 15)
Since long is W, UTC is best(UTC>LMT), now uve got ur ans.
4) I think u have to use the meridoinal parts tables to determine the ans here. (correct me if wrong).
5)Its just a simple formula based problem.
Compression ratio= (Equatorial diameter-polar diameter)/ Equatorial diameter